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93be9d544c
The ChatGPT subscription backend does not serve /backend-api/codex/responses/input_tokens for the affected account. Native requests to that path are intercepted by an OpenAI Cloudflare managed challenge, while the same path over the bundled Chrome transport returns 404 Not Found. Forwarding the client preflight can therefore never return a useful count and, before the companion classifier fix, permanently disabled the healthy Codex connection on the first challenge. Add a static /v1/responses/input_tokens route that shadows the generic Responses passthrough, uses the existing offline o200k_base token counter, and returns the standard response.input_tokens contract without issuing any upstream request. Count instructions, structured input, tool definitions and config; apply a conservative five-percent margin so the failure mode is earlier client compaction rather than a context-window overflow. Preserve the API-key and model-policy boundary from the catch-all Responses path. Tests pin the public schema, prove fetch is never called, cover text, instructions, structured input, tools, non-text parts, server-held context ids, invalid JSON, OPTIONS, and the conservative lower bound. Co-authored-by: anhth2 <anhth2@vng.com.vn>